Add a footer about other forms of history to the MD history page.

chrome/browser/resources/md_history/side_bar.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-layout/app-drawer/app-drawer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-selector/iron-selector.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-item/paper-item.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/color.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-side-bar">
   <template>
     <style include="shared-style">
       :host {
         display: block;
+        height: 100%;
         padding-top: 5px;
         width: var(--side-bar-width);
       }
 
       #drawer-header {
         align-items: center;
         border-bottom: 1px solid rgba(0, 0, 0, 0.08);
         display: flex;
         height: var(--toolbar-height);
         margin-bottom: 5px;
@@ skipping 10 matching lines @@
         background-color: rgba(0, 0, 0, 0.08);
         height: 1px;
         margin: 8px 0;
       }
 
       #clear-browsing-data {
         text-transform: uppercase;
       }
 
       paper-item {
-        -webkit-padding-start: 25px;
+        -webkit-padding-start: 24px;
         cursor: pointer;
         font-size: 14px;
         font-weight: 500;
       }
 
       paper-item.iron-selected {
         color: var(--google-blue-500);
         font-weight: 500;
       }
 
       iron-selector {
         -webkit-user-select: none;
         color: #5a5a5a;
       }
+
+      #footer {
+        /* This compensates the 120px by which app-banner protrudes under

[calamity, 2016/07/05 04:03:13]

by which app-"drawer"?

[msramek, 2016/07/06 19:24:10]

Done. Force of habit :)

+           the viewport. */

[Dan Beam, 2016/07/01 15:38:27]

/* This compensates the 120px by which app-banner protrudes under
 * the viewport. */
 ^

[msramek, 2016/07/06 19:24:10]

app-drawer, sorry for the confusion :)

Specifically here:
https://cs.chromium.org/chromium/src/third_party/polymer/v1_0/components-chro...

Which means that if I align my footer to the bottom (absolute positioning), it
ends up being 120px below the viewport.

You can see in app-drawer.html that it compensates by setting #contentContainer
padding: 120px 0. But that has no effect on absolute positioning. If we want to
avoid the magic number of 120px, I could use "padding-bottom: inherit" to
propagate that padding to my footer. But in that case we're heavily dependent on
the HTML structure (e.g. adding an additional div without inheriting the padding
would break it), so I don't think that's cleaner.

+        bottom: 120px;
+        color: var(--paper-grey-600);
+        position: absolute;
+        width: var(--side-bar-width);
+      }
+
+      #footer-text {
+        -webkit-padding-end: 16px;
+        -webkit-padding-start: 24px;
+        margin: 24px 0;
+      }
+
+      #footer a {
+        color: var(--google-blue-700);
+        text-decoration: none;
+      }
     </style>
 
     <app-drawer id="drawer" tabindex="0" on-focus="onDrawerFocus_" swipe-open
         align="start">
       <div id="drawer-header">
         <h1>$i18n{title}</h1>
       </div>
       <iron-selector id="menu" selected="{{selectedPage}}"
           selectable=".page-item" attr-for-selected="view-id"
           on-iron-activate="onSelectorActivate_">
         <paper-item view-id="history-list" class="page-item">
           $i18n{historyMenuItem}
         </paper-item>
         <paper-item view-id="history-synced-device-manager" class="page-item">
           $i18n{openTabsMenuItem}
         </paper-item>
         <div class="separator"></div>
         <paper-item on-tap="onClearBrowsingDataTap_" id="clear-browsing-data">
           $i18n{clearBrowsingData}
         </paper-item>
+        <div id="footer" hidden="[[!showFooter]]">
+          <div class="separator"></div>
+          <div id="footer-text">$i18nRaw{footer}</div>

[calamity, 2016/07/05 04:03:13]

nit: sidebarFooter perhaps?

[msramek, 2016/07/06 19:24:10]

Done.

+        </div>
       </iron-selector>
     </app-drawer>
   </template>
   <script src="chrome://history/side_bar.js"></script>
 </dom-module>